System Sensor DH400ACDCI - Manual (Page 11)

screens (RS24) are available.
3. Vacuum the photo chamber. Use clean compressed air to
blow it clean.
4. Replace the screen by aligning the arrow on top with the
field test port on the detector. Press the screen into
place. It should fit tightly on the chamber.
5. Replace the detector cover and rotate it clockwise to lock
it in place.
[7.3] Ion Heads
1. Remove the detector cover by depressing the three lock
prongs on the top of the cover and rotating the cover
counterclockwise to remove the cover and screen assem-
bly (see Figure 14). The optional CRT400 Cover Removal
Tool makes cover removal easier.
2. Carefully pull the screen out of the cover.
3. Clean the screen thoroughly with a soft brush or
vacuum. Replacement screens (RS14) are available.
4. Brush or vacuum the inside of the cover. The cover may
then be blown out with clean, compressed air.
5. Vacuum the sensing chamber before using clean, com-
pressed air to loosen and blow out any remaining debris.
6. Press the screen back into the cover.
7. Replace the detector cover onto the sensing chamber.
Rotate it clockwise to lock it into place.
REMOVABLE HEAD COVER
CLEANABLE SCREEN
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
TEST SLOT
P/N RS24 (W/O THERMAL)
LOCK PRONG
REMOVABLE SCREEN
(P/N RS14)
REMOVABLE
COVER
FOR
CLEANING
SENSING CHAMBER
Figure 13. Photo head exploded view: Figure 14. Ion head exploded view:
A78-1213-01
A78-2340-00
[7.4] Reinstallation
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check, Section [5.7].
4. Notify the proper authorities testing has been completed
and the smoke detector system is back in operation.
D400-13-00 11 I56-555-08